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Derivative Instruments (Hedged Item Offset By Derivatives Achieving Fair Value Hedge Accounting) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Fixed maturities, available-for-sale [1] $ 378,596 $ 412,905
Commercial mortgage and other loans [1] 64,554 65,425
Policyholders’ account balances (160,227) (161,682)
Future policy benefits (290,536) (306,343)
Carrying Amount of the Hedged Assets (Liabilities)    
Derivative [Line Items]    
Fixed maturities, available-for-sale 367 402
Commercial mortgage and other loans 20 20
Policyholders’ account balances (1,434) (1,627)
Future policy benefits (1,415) (1,585)
Cumulative Adjustment Included in Carrying Amount    
Derivative [Line Items]    
Fixed maturities, available-for-sale 60 79
Commercial mortgage and other loans 1 2
Policyholders’ account balances (96) (303)
Future policy benefits $ (202) $ (372)
[1] See Note 4 for details of balances associated with variable interest entities.